I've a multiple stores and some stores get 5 sales a month on $10 item and for that I can't afford Shopify.

I am looking for something which I can host on my own as I've nearly free servers (I receive digital ocean credit through affiliate sales on the guides I wrote) so hosting is free for me and tinkering is free as there not much work where I working so I can fix my website in that time.

Also I don't like to pay monthly for closed source product. That's my ideological reason, it's low in priority but I always choose open whenever possible